Adiel y



July '5, 1927.

1,634,369 A. Y. DODGE BRAKE SHOE Filed April 16. 1926 [lll/111111111101 ENVENTOR AYDIELY; DODGE IZ I ATTORNEY 12, with three shoes 14, 16, and 18.

Patented `luly l 5, 1927.

UNITED STATES N 1,634,369 PATENT OFFICE.

ADIEL Y. DODGE, OF SOUTH BEND, INDIANA, ASSIGNOR TO BENDIX BRAKE COMPANY, OF CHICAGO, ILLINOIS A CORPORATION OF ILLINOIS.

BRAKE SHOE.

Application led April 16, 1926. `Serial No. 102,578.

This invention relates to brakes, and is illustrated as embodied in aninternal eX- panding brake for a motor truck. An object of the invention is to increase the strength of the brake shoes, and especially to do so in a manner permitting them to be made more cheaply, as for example from sheet-metal stampings. l

Having this object in mind, an important feature of the invention relates to forming the shoe with a body generally triangular in section, so that the stiffening web with its diverging sides forms a trussed reinforcement for the shoe.

l/Vhile such a construction is not essential, as a matter of economy I prefer to form the shoe of sheet metal, either as one integral stamping or as a plurality of stampings secured together to build up the described shoe. In one desirable arrangement, there are three separate members, one forming the friction face, and the other two secured together to form the web and diverging from each other toward the edges of the friction face. To facilitate fastening these members together, it is desirable that they should be continued as double-thickness portions for short distances beyond the corners of the triangular section.

Other features of theinvention relate to forming novel anchoring means at one end of the shoe, to providing for pivotally connecting a servo shoe at the other end, and to other novel and desirable arrangements and constructions which will be apparent from the following description of the illustrative embodiment shown in the accompanying drawing, in which:

Figure 1 is a vertical section through the brake, just inside the head of the drum, showing the shoes inside elevation;

Figure 2 is a section on the line 2-2 of Figure 1,showing the anchors of the brake;

Figure 3 is a section on the line 3-3 of Figure 1, showing the pivotal connection of two of the shoes;

Figure 4 is a section on either of the lines 4-1 of Figure 1, showing the construction of the end shoes; and

Figure 5 is a section on the line 5 5 of Figure 1, showing the construction of the central shoe.

The particular brake selected for illustration includes a'drum 10 and a backinfr plate scho@ 14.

is anchored by being pivoted at its end on a pm 20, between the ends of shoe 16 and well within the curve of the shoes, while shoe 16 has at its end spaced arms 22 straddling the end of shoe 14 and offset within the curve of the sho-es, where the arms are pivotally anchored on a pin 24, thus in effect overlapping the two shoes. Anchors 20 and 24 may, if desired, be connected by a reinforcing plate 26.

Shoe 18 is connected to spaced arms at the opposite end of shoe 16, by means such as a pivot 28 having an enlarged head slidably engaging backing plate 12. Shoes 14 and 18 are forced apart to apply the brake, against the resistance of a return spring 30, by means such as a double cam 32 having an end fiange confining the ends of the shoes laterally, whereupon shoe 18 turns and forces shoe 16 into engagement with the drum against the resistance of an auxiliary spring 34.

The present application relates to the construction of the shoes, whether they are used in the above-described brake or in a brake of some other type.

Each of the shoes 14 and 18 is formed with its body all in one piece, as shown in section in Figure 4.k The cylindrical friction face 38 of the arcuate shoe, provided with any desired lining 40, is in these shoes integral with the stiffening web. The web is in the form of two sections 42 and 44, engaging each other attheir inner edges and some distance from their inner edges and riveted or spot-welded or otherwise secured together, and which diverge from each other toward the side edges of the friction face 38.

Preferably the diverging sides of the web enga-ge the friction face some distance from its edges, to form double-thickness portions along the edges. It will be seen that this provides a hollow arcuate shoe,generally triangular in section so that the web forms a trussed reinforcement for the friction face, and with double-thickness portions project- 'ing beyond the corners of the triangular section.

At its lower end, the sides 42 and 44 of shoe 18 are flattened together to form an arm mounted on the pivot 28 (Fig. 3), integral sleeves or bushings 46 preferably being formed in the sides to embrace the pivot. Similarly sides 42 and 44 at the lower end of shoe 14 are flattened together to form an `anchoring arm Which is oifset Within the curve of the shoes and Vanchored on pin 20.

Shoe 1G is built up', according to the same general plan, but including three separate stampings-for similar members. VO-f-'these,

one stamping or band 50 forms the fcylin-l drical friction face, with any desired lining v52, While two stampings 54 and 56 iorm'the stiilening Web. Stampings5i and .56, which may be stifl'ened at their inner edges by short oppositelygproj ecting n ianges 58, are riveted Vform `doublethickness portions .along the edges.V Stampings 54; and are -seeuredto member 5.0 Jby rivets, by spot-Welding, or. v1n

any other desired manner. lrlember 50vmay be Varied in Width VWithout changingf'tanipings 54; and 56, overhanging the stampings moreoiless,V thus making it possible'to build up shoes of diil'erent yWidths `with 'the same stampings 54C and 56.

y At the anchored end of the ings 51ifand 56 preferably project a considerable distance :beyond the friction face, to form the above-described spaced arms 22 straddl'ingthe end of shoe le and oliset insidethe curve of the shoe andthere an-k clioredy on pivot 2li. At the oppositeend, the stampinos project a short distance beyond the friction face to straddlefthefend of shoe 18 and be mounted on pir/01128. rlhe metal of the stampings laround pivots 2li and V28 Y may be drawn out to form sleeves or integral bushings 60 .embracing the.pivots.

l/Vhile an illustrative construction has been describedin detaiLit-.is'not myintention to limit the scope of the invention to that particular construction, or otherwise than' by the termsof the appended claims. Part of thegsub'jectqnatter hereinfclaimed is continued feo from my prior application No. December t8, 1921i. Y

`lola-im: A, f f l f 1. A brake shoe comprising a cylindrical friction part ywith astiifening web, on its inside lhaving diverging portions f engaging the friction part adjacent its' edges yand forming therewith `a trussed shoegenerally triangular .in section, the stiffening Web being arranged forrmountingon aefpivot at oneend. V1 i 2. A brake shoe comprising a cylindrical friction part with a stiifeningeweb.. on its insideiof pressed metal separate from the friction part and having diverging portions engaging :and secured to the friction` part adjacent -itsedges and :forming therewith a .n3-ign, ein

trussed shoegenerally triangular insection,

the shoe `being engageable by `an :operating partand a stifening1 device at onelend and being arranged to loe piyoted. at theother end.

3. A brake shoe comprising band Vand a' separate stifiening web on the inside ofthe bande having diverging Vsides its edges, said sides being continued beyond the band at one end and arranged to be `5. A brake shoe `comprising aIcylirnirical` p art and two stiii'ening parts, the ytwo ystfffenl ing partsl engaging each other for some :dis-

tance fromv 4their inner edges to formen. double-thickness lweb and then diverging `toward the outer edges of the cylindrical part to lform atrussed reinforcement there# for.- y

6. A brake shoecomprising separate members formingl a vcylindrical part and two stifl'ening parts,the two stiening parts en-.1.

gaging each other for `some distance from their inner edges to form a double-thickness web `and then diverging toward .the outer edges of the cylindrical Vpart to form .e trussedl reinforcement therefor. l

7. A brake shoe comprising 4e cylindrical part and a stiifening Web/therefor having portions diverging from the centra-l plane ofy the shoe and engaging the'cylindrical la cylindrical y.7o engaging and secured `to the band 'adjacent partsome distance insideitsedges Ato form a .trussed reinforcement therefor. v

8. Abrake shoe comprising 1acylndrical part and .-a stiil'ening web therefor having. portions diverging from the central planeet' the shoe and engaging the cylindrical part some distance inside :itsedges and theneon` tinued toward -said edges in engagement* with the innerv face 'of the cylindrical part.

9."A hollow arcuate bralaefshoe-having an y inwardly/offsetarni at its .end and genenal'ly triangular-in sect-ion to form a trussed stiffening Web "between the edges of the 10. A -n arcuate -brake'shoe whavingspaced i arms atits :end .and generally triangular in section .to form a1 trussed vstiffenirgg Webbetweenjthe edges .ofthe shoe.v

ll. vA brakeshoe comprising a cylindrical Webhaving two sides diverging from eac from the inner edge ofthe Weband engagefother some distanceA inggthe cylindricalpart inside'lof enter edges.. y i v 1. A brake shoe comprising e; friction face and a :stiifening web including divergingtsides forming trussed- .reinfnscementV for the! friction face 4and extended vbeyond the friction face as a ing arms.

13. An arcuate brake shoe comprising a friction face and a stifening web including diverging sides forming a trussed reinforcement for the friction face and extended beyond the friction face as anchoring arms olfset within the curve of the shoe. e

14. A triangular-section arcuate brake shoe having laterally-extended reinforcing portions along its inner edge.

15. A triangular-section arcuate brake shoe having two laterally-extended oppositely-directed reinforcing flanges along its inner edge.

16. An arcuate brake shoe including three stampings secured together to form a trussed hollow body generally triangular in section, and in part overlapping each other to form double-thickness portions beyond the corner of said triangular section.

17. An arcuate brake shoe including three stampings secured together to form a trussed hollow body generally triangular in section, with a 'double-thickness portion projecting pair of spaced anchorsome distance beyond each corner of the triangular section.

18. An arcuate hollow brake shoe having a trussed body portion generally triangular in section, with a double-thickness portion projecting some distance beyond each corner of the triangular section.

19. An arcuate hollow brake shoe having a trusse'd body portion generally' triangular in secton, with a portion projecting some distance beyond each corner of the triangular section.

20. An arcuate brake shoe including three separate members, the first being a cylindrical member forming the friction face, and the other two being secured together and to the first to form a stifening web and projecting beyond the friction face at one end to form anchoring means and projecting beyond the friction face at the other end to be connected to a servo shoe.

In testimony whereof, I have hereunto signed my name.

ADIEL Y. DODGE. 

